Android Open Source - coursera-android-001 Main Activity

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The source code is released under:

MIT License

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Java Source Code

package course.labs.fragmentslab;
/*from   w w  w  . j a  va  2s  . c  o  m*/
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends Activity implements
    FriendsFragment.SelectionListener {

  private static final String TAG = "Lab-Fragments";

  private FriendsFragment mFriendsFragment;
  private FeedFragment mFeedFragment;

  protected void onCreate(Bundle savedInstanceState) {

    // If the layout is single-pane, create the FriendsFragment 
    // and add it to the Activity

    if (!isInTwoPaneMode()) {
      mFriendsFragment = new FriendsFragment();

      // add the FriendsFragment to the fragment_container
      getFragmentManager().beginTransaction().add(, mFriendsFragment).commit();

    } else {

      // Otherwise, save a reference to the FeedFragment for later use

      mFeedFragment = (FeedFragment) getFragmentManager()


  // If there is no fragment_container ID, then the application is in
  // two-pane mode

  private boolean isInTwoPaneMode() {

    return findViewById( == null;

  // Display selected Twitter feed

  public void onItemSelected(int position) {

    Log.i(TAG, "Entered onItemSelected(" + position + ")");

    // If there is no FeedFragment instance, then create one

    if (mFeedFragment == null)
      mFeedFragment = new FeedFragment();

    // If in single-pane mode, replace single visible Fragment

    if (!isInTwoPaneMode()) {

      //replace the fragment_container with the FeedFragment
            getFragmentManager().beginTransaction().replace(, mFeedFragment).addToBackStack(null).commit();

      // execute transaction now


    // Update Twitter feed display on FriendFragment



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